BE477778A - - Google Patents

Description

       

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  Remote control system.



   The present invention relates to remote control systems and, more particularly, to centralized traffic control systems for railways, comprising an office and a number of stations connected by lines on which traffic signals. pulse codes are transmitted to cause the operation of the traffic control devices located along the flight and to indicate the status of these devices in the office.



   The system according to the invention is of the time-coded type, using long and short element codes which are transmitted, one at a time, in a single line circuit and it is based on the system described in the patent. United States n. 2,229,249 of January 21, 1941. The system according to the present invention comprises certain improvements compared to that described in this patent and relating to the use of a

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 Bridge type center battery line circuit disclosed in U.S. Patent No. 2,303,875 of 1st. December 1942, to allow simultaneous use of the same lines by the centralized traffic control system and for other communications.



   The constituents of the system according to the invention are preferably assembled in the form of code and storage units each containing a group of relays. The system uses a station code unit at each site location to transmit indication codes and to selectively receive control codes, with one station storage unit for each group of units of the devices. controlling traffic, to associate devices with the station code unit.

   The office facility preferably includes an individual control panel for each group of units of the controlling devices, traffic and an office code unit which is circuit-connected to the station code units to establish communication. selectively between each switchboard and the corresponding station storage unit.



   According to the invention, a station storage unit requires fewer relays than before, owing to the non-existence of a pair of storage relays which operate alternately and successively to record the nature of a series of relays. 'pieces of code, instead of a series of relays, one for each element as we did previously. another characteristic of the invention is constituted by the improved arrangements for associating additional station storage units with the same code unit, reducing the number of relays required when the number of devices controlled in one place is greater. big than that. which is Ordered and indicated by a single code

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 composite.

   A limited number of storage units can be connected directly to the station code unit, as before, and in addition, auxiliary groups of the selection relays, called "pyramid" units can be interposed for to provide communication for additional storage units, only one station code unit being required at one location, even though the number of devices ordered is sufficient to absorb the full capacity of the system.



   According to another characteristic of the invention, there is provided a start-up relay of the type normally energized at each station storage unit replacing two relays, as was required previously, and it is also more efficient in operation. .



   The invention, arranged to indicate the movement of trains, includes an improved "track OS storage" device for transmitting an indication of the movement of a train in a particular section of track. , even if the circuit is not available when the train movement is taking place.



   The system according to the invention also includes numerous circuit improvements whereby the synchronization of the relays which measure the lengths of the code elements is controlled more exactly, as will be seen later, thus increasing the frequency. safety margin of the system and operating it properly over a wide range of local battery voltage changes.



   The invention also relates to improved arrangements for operating effectively and simultaneously on a circuit which is used for the operation of telephone call selectors, without interference.



  The invention includes, in the office, devices -

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 preventing the reception of a code containing an obvious error as may occur due to a fault, when two stations try to transmit different code calls at the same time.



   Other advantages and particularities of the invention will emerge from the description which follows, of a type of apparatus according to the invention and of several variants thereof, with reference to the appended drawings in which:
FIGS. 1A, 1B and 1C, taken simultaneously, represent in condensed form the installation of offices used in a type of centralized traffic control system according to the invention. The device. Figures 1A, and 1B comprises; the office code unit, for generating and sending the control code signals (which will be referred to below for simplicity as "codes") to the line circuit and for receiving indication codes.

   Figure 10 shows an individual table containing the levers and lamps used to control and indicate a group of typical units of devices controlling traffic on site, with the selective relays used to associate the switchboard with the control unit. office code.



     It is understood that each switchboard is connected in a similar way but using a different arrangement of selector relays.



   Figures 2A and 2B and 2C, taken together, show the apparatus corresponding to a typical location on site, arranged as desired when there is only one group of units of controlled devices. this place. The apparatus of Figures 2A and 2B, with the left portion of Figure 2C comprises the station code unit, while the right portion of Figure 2C shows the relays of a storage unit. station suitable for controlling a typical group of traffic control devices.

   FIG. 2C also comprises a track diagram representing a group of this kind,

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 which, as shown, features a mechanically actuated lane change and a group of signals such as those commonly associated with one end of a crossing lane on a single lane line. It is understood that the code unit portion shown in Fig. 2C is arranged to provide connections for one to five station storage units, such as that shown.



   Figure 3 shows the circuits of the pyramid units referred to above and replaces the left part of Figure 2C in the circuit plans when it is necessary to have connections for the units of the pyramid. 'additional storage.



   Figure 4 shows a variation of a portion of an office code unit which replaces the top portion of Figure 1A in circuit diagrams, when the system is to use a circuit by which telephone selectors are controlled, this view also showing a typical code wheel and apparatus for transmitting code calls from selectors.



   Figure 5 shows another variation of a portion of the desk code unit of Figure 1A, including a circuit for controlling a secondary transmit relay TS which can be used when the control desk is in operation. located at an intermediate point of the line or to satisfy other special line conditions.



   In figure 1A, two line wires Y and Z are seen which run from the office to the different stations and constitute a circuit for the centralized traffic control system, which can also be used for telephone and telegraph communications as described above. said about the like line wires of patent 2,303,875 above. As shown, this circuit is normally excited,

  by

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 current coming from battery 80 of the office, the positive terminal of which is normally connected to wire Y and the negative terminal to wire Z by the rest contacts b and d of a PC pole changeover relay and a transmitter relay of the OE office and through the windings of a suitable low-pass filter LPF and control codes are transmitted by opening and closing the circuit by periodic operations of the OT relay. The circuit also comprises rest contacts and d of an exclusion relay X, provided according to a characteristic of the invention, and, in addition,

   the primary of an RT pulse transformer by means of which the OR office line relay is controlled when indication codes are received and the normally closed contact of a DB button by means of which the line can be opened by hand .

   The OR relay is of the polar restraint type, as shown in the last cited patent, and operates by pulses of alternately opposite polarity, supplied by the transformer RT when the line current varies due to the operation of a station transmitter relay T, as shown in FIG. 2A. Indication codes are transmitted by the control relay T so as to periodically connect the line wires to each other by an impedance of relatively low value compared to the normal impedance of the circuit.



     At each local station, as shown in Figure 2A, a high resistance R line relay is mounted between the Y and Z wires in series with a resistor W1, the link normally comprising normally closed contacts b and d. of a main relay M and the windings of an LPF low-pass filter similar to that of the office. R station line relays are of the polarized pole type and they are normally energized in parallel with each relay closing its left and b contacts, as shown, when its left terminal is positive

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 and closing its right-hand contacts a and b when it is energized in the opposite direction, with its positive right-hand terminal or when it is de-energized.

   The connection of the station device with the Y and Z wires of the line is controlled by an RPP fault relay, in a way which will be indicated below, but as this relay does not come into play in the operation normal of the system, it can be assumed for the moment that it remains in its normal excited position, shown.



   Each R station line relay controls a group of slow release timing relays L1, L2, LP, LB and LPB. These synchronization relays are normally de-energized and are controlled by relay R to control the transmission and reception of codes according to line conditions in the same way as the relays similarly designated in the first of the two. the aforementioned patents. Their release time is likewise controlled by electronic rectifiers, as shown, the rectifiers also serving to prevent contact sparking and to minimize contact wear, as explained in the subject patent.



   The system according to the invention is arranged so as to use codes each comprising 16 stages and, in each control code transmitted by the office transmitter relay OT, the circuit is open during each odd stage and closed at each even stage. More particularly, the office code unit is placed in the desired state to transmit a control code by energizing the main relay OM of FIG. 1A which completes circuits serving to effect the periodic operation of the associated transmitter relay OT, of so as to open and close the circuit to actuate the line relays R in concordance in all the stations, the periods of opening and closing constituting the elements of the code.

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   When the line circuit is opened to start the first element of a code, each line relay R is released and its right contact b closes a circuit from the positive terminal or the appropriate local source daytime supply B of current, passing through a closed contact d of relay 16, the closed contact a. of relay L2, the rest contact g of relay LBP, via relay L1, to go to the negative or common return terminal C of the source.

   Relay Ll then attracts its armature and its working contact has closed a circuit starting from terminal B on the right contact b of relay R, 'passing through relay L2 to go to terminal C1, so that relay L2 attracts its armature by closing a circuit on its own work contact a and also closing a circuit starting from terminal B and passing through the work contacts c of relays Ll and L2 to close relay LP, which, in turn, closes a circuit passing through its work contact a to close the LB and LBP relays. The LBP relay is energized in tandem with the LB relay when the latter closes its make contact a so that these relays are released successively when the LP relay has been released.

   When relay L2 attracts its armor at the first stage of a code, its contacts a and g move the connections of relay L1 from the right contact to the left contact of relay R and then contact b from the switch. LBP relay is drawn to maintain this last connection until the code is transmitted. As a result, relays L1 and L2 are energized alternately, relay L1 on the left contact b of relay R and relay L2 on the right contact b of relay R, under the action of periodic operation. relay R. Relays L1 and L2 remain closed for the duration of the short code elements, the relay L1 releasing its armature during each odd long element and the relay L2 during each even code element.

   As a result, these relays

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 are used to indicate a code character in a received code and, together with the LP relay, they are used to control the lengths of the long stages of a code, generated by the associated transmitter relay T. The LB relay and its LBP repeater relay are bridge relays which remain closed for the duration of a code and are used to prepare different local circuits when the coded operation of an R relay begins, and to open these circuits when it ceases.



   The OR desktop line relay, Figure 1A, controls an analogous group of timing relays OL1, OL2, OLP, OLB and OLBP which operate in the same fashion. However, the OR relay is normally de-energized and it maintains its contacts in either of the positions to which they were brought by a momentary impulse and, as a result, it can be accidentally reversed. If this happens, the OR relay is automatically brought back to the normal position by action of the synchronization relays in the manner which will be indicated later and it can therefore be assumed that the OR relay, although de-energized, occupies its normal position, corresponding to that of'! station line relay normally energized, when the system is in its normal rest position.



   When indication codes are received, the OR relay is actuated by pulses of alternately opposite polarity, supplied by the transformer RT. During the transmission of the control codes, the main relay OM, figure 1A is kept energized and its contact c short-circuits the transformer RT and disconnects it from the OR relay and the latter is then actuated locally by the transmitter relay OT. When the OM relay attracts its armature, the OR relay is energized in the normal direction, as shown, in the circuit starting from the middle terminal 0 of the local battery, through its lower winding, the rest contact @ of the re-

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 lais OT and the working contact g of the OM relay to go to the negative terminal C.

   The OT relay is energized by the d contact of the OM relay and it is then controlled by the wires 68, 61 and 62 in a way which will be indicated below to generate the code.



  Whenever the OT relay draws its armature, it opens the circuit on its contacts b and d to release the line relays R to the stations and to connect the Y wire to the Z wire through a resistor W5 to discharge the load current from the line, as is to be desired when the line is in a cable.



  At the same time, the OT relay actuates the OR relay to reverse the circuit starting from the positive terminal B on the working contact e of the OT relay, to go through the OR relay to terminal 0.



  Each time the OT relay is released it closes the line circuit to close the R line relays and, at the same time, it activates the OR relay to bring it to the normal position, by closing, on its rest contact. e, the circuit going from terminal 0, through relay OR, to terminal C. The relay OR thus operates in conjunction with the relays R during transmission of the command codes.



   Each line relay controls a chain of counter rela.is generally similar to those of the first aforementioned patent. Thus, the relay OR, by means of its contact a, controls the counter relays 01 to 08 and 016 of FIG. 1B and each relay R controls a similar chain such as the relays 1 to 8 and 16 of FIG. 2B. Referring to Figures 2A and 2B, we see that a circuit closes momentarily under the action of the first of a series of operations of relay R, circuit going from terminal B of the contact, from right to of relay R, by the rest contact b of relay LBP, the open contact g of relay Ll, wire 181, relay 1, to terminal C.

   As a result, relay 1 attracts its armature during the first stage

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 of a code, when the relay L1 is energized, and when the LBP relay attracts its armature, it opens the circuit just indicated and closes a retaining circuit for relay 1, passing through the NO contact b of LBP relay, wire 119, break contact µ of relay 2, break contact a and the winding of relay 1, to go to terminal C.

   When relay R is brought back to normal to start the second operation of a code, terminal B is disconnected from relay 1 which remains closed as a result of the discharge path formed by the rectifier connected to wire 119 and a circuit is closed starting from the left contact A of relay R, passing through the working contact d of the LBP relay, wire 120, the rest contact a of relay 8, the working contact µ of relay 1, relay 2 , to go to terminal C. Consequently, relay 2 attracts its armature and closes its retaining circuit going to terminal B of wire 120 by its make contact ± and the rest contact µ of relay 3.

   Operation of contact b of relay 2 disconnects relay 1 from the rectifier, but closes a second discharge path for relay 1, comprising the winding of relay 3 so that relay 1 opens shortly after the relay 2 has drawn its armature, but without making sparks on its contact a whose fall connects relay 3 to wire 119 to put it in a state such that this relay operates for the third stage of the code, the relays 4 to 8 are controlled in the same way, one at a time, by current supplied alternately by the wires 119 and 120, due to the fourth to the eighth code stages.

   If the various maneuvers associated with these stages, as will be described later, are suitably carried out, a chain repeater relay OR closes during the eighth stage to prepare a circuit for closing relay 1 by the working contact 12 of the relay. 8, so that relay 1 operates when

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 of the following operation so that, after relay 8, relays 1 to 7 are actuated in a second cycle for the ninth to fifteenth stages of the code, with relay 16 operating in place of relay 8 in the sixth stage during which the The appliance is brought back to normal, in the idle condition.



   By comparison of these circuits with those of the first cited patent, it can be seen that there is a discharge path for each of the relays 1 to 8, each comprising the winding of another relay, these paths being effective for each intermediate stage. of the code, while in the earlier patent they are effective for certain stages and not for others. As a result, the circuits, as shown here, ensure more uniform and efficient operation of the counter relays upon reception of a code and, since these relays control the transmitter relay T, the transmitted pulses are made more uniforms.



   Referring now to Figures 1A and 1B, we see that the counter chain circuits of the office are analogous to those described above, relay 01 drawing its armature in the first stage through wire 81 , the remaining relays being actuated, one at a time, by current supplied alternately by wires 19 and 20 due to the periodic operation of the OR relay.



   In the system of the first aforementioned patent, the synchronization relays L1 and L2 and the counter relays are energized in parallel by the same contacts of the line relay, in which case the release periods of the synchronization relays depend to a certain extent on the current. that a counter relay is connected in parallel with it to constitute a discharge path for a part of its stored energy. This is a variable condition in the operation

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 normal system, as stated above, and the presence of separate ± and b contacts for the R and OR line relays makes the operation of the synchronization relays more uniform and accurate.



   The transmission of a control code, stage by stage, by the office apparatus of Figures 1A, 1B and 1C will now be described.



   To start a control code, the operator momentarily presses an STB start button, identifying the control panel associated with the station storage unit to which the code is to be transmitted, to close a control panel. start-up relay such as relay 234ST, relay which is kept energized on a restraining circuit going to terminal B of normally-open contact 1, of an associated switchboard selector relay, such as relay 234 @, until until the desired selection has been made. Wire 47, in FIG. 1C, is normally connected by the rest contacts of various selector relays E, F, G, to connected circuits going to contact b of the start-up relay ST of each board.

   Consequently, the closing of the make contact b of relay 234ST extends the connection of terminal B, by a special connection which, as shown, comprises the normally closed contact j of relay 234S and the closed contacts g relays 23G, 2F and E, to wire 47 and, if the system is in its normal state of rest such that the cells OL1 and OL2 are open, a circuit is closed starting from terminal B on wire 47, passing through the rest contacts b of the OL1 and OL2 relays, the OM relay, to go to wire 17 and then to terminal C on the normally closed contact of the CB clear button.

   As a result, the OM relay closes under the action of operation, of any start relay such as 234ST and closes a pulsating circuit for the relay *

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 office transmitter OT starting from terminal B on the rest contact of relay 016, passing through the rest contacts g of relays 07, 05, 03 and O1, wire 68, contact d of relay OM, relay OT and resistors W2 and W3 to go to terminal C.



  As a result, the OT relay attracts its armature to start the first stage of the code, these working contacts b and d opening the circuit to release the station line relays and its working contact e closing a circuit already indicated to bring the relay OR in its reverse position, which causes the OR relay to actuate the OL synchronization relays and the first counter relay 01 as already described.

   When the OLB relay pulls its armature, its contact 2 closes a restraint circuit for the OM relay, starting from terminal B on the rest contact e of relay 016, passing through wire 18, the contacts c of the OLB and OLBP relays, in parallel, contact a and the OM relay winding, then wire 17, to go to terminal C.



   The first stage of each command code is a long stage as opposed to an indication code in which the first stage is relatively short.



   When relay 01 attracts its armature during the first stage, its rest contact g opens the pulsating circuit for relay OT, but this relay is kept energized to generate m long stage on a branch circuit, starting from the terminal B on the NO contact 9 of relay 01, passing through the NC contact d of the SP relay, the µ contact of the OL1 relay and the b contact of the OLP relay in parallel, the NC contact, of the SP relay, the wire 68, the contact d of the OL relay, the winding and the working contact c of the OT relay, the resistor W3, to go to terminal C the OL1 and OLP relays then open successively, the opening of the contact b of the OLP relay cutting terminal B from wire 68,

    which causes the OT relay to open, to energize the line relays R and

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 move the OR relays to the left to start the second stage, the OR relay causing relay 02 to close and relay 01 to open.



   Closing the NO contact & relay 01 closes the pulsating circuit for the OT relay through wire 68, this circuit operating repeatedly to generate the short stages of the code. The closing time of the OT relay depends on the time constant of the circuit comprising resistors W2 and W3. When the OT relay closes, its make contact ± short-circuits resistor W2 so that the OT relay excitation rises faster to a higher value than would otherwise be the case and, as a result, gives a period more constant release under varying voltage conditions.

   It will be noted that its release period is determined by the time constant of the circuit comprising its winding and the resistance W3 only and it follows that its closing and opening periods can be adjusted independently.



   The wires 61 and 62 constitute connections, which will be described in detail below, serving to keep the OT relay closed or open to generate the long stages of the code. The link going from terminal B to wire 61 is controlled by relays OL1 and OLP so as to keep the relay OT closed after its pulsating circuit has opened, to generate an odd long stage while an analog connection controlled by the OL2 and OLP relays, going from terminal B through wire 62, contact f of relay OM and rest contact c of relay OT, to the left terminal of relay OT, is effective in short-circuiting its winding and , therefore, keep the OT relay open after its pulsating circuit has opened to generate a long, even stage.

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   The second and eighth stages of each code may be arranged in any of different combinations of three long and four short stages, so as to form station code calls which are identified by three digit numbers in the code. where the digits represent the long stages of the code call. So the number
234 assigned to the individual board of Fig. 1C and the corresponding station storage unit of Fig. 2C is a number in which the second, third and fourth code stages are long and the fifth through eighth are short.



   The code calls are generated by close connections from the contact terminal b of the office start-up relays ST to wires 61 and 62, this being arranged so that when a certain number start-up relays are energized, their respective codes are transmitted one at a time, in a given order of code superiority, a long element taking priority over a short element of each stage. This means 234 is the highest code call, 235 the next, etc. 678 is the lowest.

   The selection of the desk board containing an energized relay ST is carried out by energizing an input relay E (figure
1C) under the action of the first element of the code, after which comes the excitation of three relays successively by the three long elements of the code call, comprising a first selector relay F, a group selector relay G and a relay station selector S, these relays being identified more particularly by prefixes designating the code elements by means of which their operation is effected. For example, the 2F relay operates under the action of the second element, the 23G relay under the action of the third, provided that the 2F relay has operated,

     and the 234S relay under the action of the fourth provided that the 23G relay has operated. When used at

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 its capacity, the system uses five F relays, fifteen G relays, and 35 S relays generally arranged as shown in Figures 2, 3 and 4 of the first of the aforementioned patents and, since the relation of these relays with each other and that the links used to associate the various tables with the code unit are to be found in this prior patent, the circuits have been represented here in condensed form, giving the circuits in detail only for one. table and that for a selector relay of each type.



   Relay E attracts its armature at the first stage of each code, by a circuit starting from terminal B on contact a of relay OLBP (figure lA) passing through wire 60, the rest contact a of relay SP, contact of d of relay 01, wire 21, relay E, to arrive at terminal C and relay E then closes a restraining circuit on its work contact a, passing through the rest contact m of relay 2F and con - rest tacts of relays 3F to 6F if there are any, wire 29, resistor W4, the rest contact a of relay SP, and wire 60 to go to terminal B of contact a of relay OLBP.



   It is understood that each of the connection circuits starting from terminal B on contact µ of a start-up relay ST, to go to wire 47, identifies the corresponding code call, as indicated by the references 234 to 238, the neighboring contacts g @ k of relay 23G. When relay E attracts its armature, these connections are all cut from wire 47, they are divided into groups by contacts at k of relay E, and they are connected to wires 32 to 36 to prepare circuits for generating the first digit of the code call.



   When relay 02 attracts its armature in the second stage, the connection of terminal B with wire 32 is extended by contact c of relay 02, the rest contact ± of relay

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 OCR, to go to wire 62 and from there to the left terminal of the OT relay thereby shorting its released OT winding and holding relay to generate a second long stage.

   The OL2 and OLP relays open, completing a circuit starting from terminal B on wire 60, passing through the rest contact a of the OCR relay, wire 58, the rest contacts d of the OL2 and OLP relays, wire 64, the rest contacts to OCR relays, and OCD, the working contact d of relay 02, wire 22, the working contact b of relay E, relay 2F, to go to terminal C. The relay 2F attracts its armature, its contact a closing its retaining circuit which passes through the rest contacts a of relay 23G and other relays G of the same group, for example relays 24G to 27G, if any, and by wire 29 to go to terminal B via wire 60.



   When the 2F relay attracts its armature, the connection circuits, starting from wire 32 to go to terminal B via the contacts of the start-up relays of which 2 is the first digit of their code calls, are disconnected from the wire 32 and are divided into groups by contacts g to k of relay 2F and they are connected to wires 33 to 37 to prepare circuits to generate the second digit of the code call.



  The interruption of the link going to wire 62 by opening the rest contact & relay 2F allows relay OT to attract its armature to begin the third stage.



   Relay E is released by opening of the break contact m. of relay 2F and the opening of the working contacts h to k of relay 9 disconnects the branch circuits to generate code calls in which the first digit is 3, 4, 5 or 6.



   Each of the relays E, F and G and certain other relays which will be described later have a discharge circuit

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 in which there is a resistor instead of the usual rectifier. These resistors have a relatively large value compared to the resistance of the relay winding and give a slight delay in accordance with the requirements of the circuit.



  They also serve to prevent the formation of contact sparks.



   When relay 03 attracts its armature, the link starting from terminal B through wire 33 is extended by contact c of relay 03 and the rest contact of relay OCR to go to wire 61 in order to close the retaining circuit of the OT relay to generate the third long stage of the 234 code call.



  The OL1 and OLP relays open by closing a circuit starting from terminal B on wire 60, passing through the rest contact a of the OCR relay, wire 58, the rest contact h of the OLP and OL1 relays to go to the wire 63, the rest contacts b, of the OCR and OCD relays, the working contact d of relay 03, wire 23, the working contact b of relay 2F, relay 23G to go to terminal C. The relay 23G attracts its armature, its contact 1 closing a retaining circuit which passes through the rest contacts a relays G associated in series, and by wire 29, to go to terminal B on wire 60.



   When the 23G relay attracts its armature, the branch circuits going from wire 33 to terminal B by the start-up relay contacts comprising 23 as two, first digits of their code calls, are disconnected from wire 33 and branched by contacts & to k of relay 2G and they are connected to wires 34 to 38 to prepare circuits for generating the third digit of calls 234 to 238 respectively. Interrupting the link with wire 63 by opening the rest contact & relay 23G allows relay OT to open to begin the fourth stage.

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   Relay 2F is released by opening the rest contact of relay 23G and opening the working contacts h to k of relay 2F disconnects the connection circuits controlled by these contacts, thus limiting the control of the third digit to these. group start relay 234 to 238.



   When relay 04 attracts its armature, the connection starting from terminal B through wire 34 is extended by the ± contact of relay 04 and the closed contact! OCR relay and wire 62 to hold the OT relay open to initiate the fourth long step of the 234 call code. The OL2 and OLP relays open ;, closing a circuit from terminal B on wire 60 and passing through the rest contact a of the OCR relay, wire 58, the rest contacts d of the OLP and OL2 relays, wire 64, the contacts d of the OCR and OCD relays, the open contact d of the relay 04, the wire 24, contact b of relay 23G, relay 234S to go to terminal C.

   The 234S relay attracts its armature and the closing of its make contact extends the link coming from terminal B to its left terminal, going to wire 30 and from there, through the relay SP, to terminal C so that the relay SP attracts its armature, by closing its retaining circuit starting from terminal B and passing through wire 60, its front contact a and the winding to go to terminal C and also closing a retaining circuit for the relay 2345 starting from terminal B on the make contact a of relay SP, passing through wire 30 and the front contact a and the winding of relay 234S to go to terminal C.



   Interrupting the link with wire 62 by opening the rest contact j of relay 234S allows relay OT to attract its armature to begin the fourth stage.



     It is therefore seen that while at the end of the first long stage, the OT relay is actuated by opening a contact of the LP relay, in the case of long stages of the code call of

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 station, the OT relay is actuated by opening the normally-closed contacts of the selector relays 2F, 23G and 234S respectively, each of these relays attracting its armature due to the opening of a closed contact of the LP relay. As a result, the long stems of the station code call are all the same length. but they are slightly longer than the other long stages of the code which end the same as the first long stage.



   When the SP relay attracts its armature, opening its rest contact & disconnects terminal B from wire 29 thus opening relay 23G. Opening the NO contacts b to f of relay 23G opens the closing circuits of relay 234S and other analog relays 235S to 238S, not shown, of the same group, while opening of the NO contacts h to k of relay 230-prevents the formation of long code elements on the fifth to eighth stages and the contacts o of counter relays 05 to 08, going to wires 35 to 38, are successively closed.



   Consequently, the fifth to eighth stages are short, and when relay 08 attracts its armature, a circuit is established from terminal B, passing through wire 60, contact h of relay 08, contact B from the SP relay, the OCR relay, to go to terminal C. Consequently, the OCR relay closes on the eighth stage by closing a restraint circuit on its make contact a.

   The opening of the normally closed contact a of the OCR relay disconnects the terminal B from the wire 58 and, consequently, from the wires 63 and 64, and the closing of the open contact g of the OCR relay prepares a starting circuit wire 19 passing through, the rest contact B of the RCR relay, the rest contact ± of the relay 07 and the open contact b of the relay 08 to go, through the relay 01 to terminal C, which allows the relay 01 to be actuated in sequence, in order, after relay 08.

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   Steps 9 to 15 of the code have now been made usable for the control of seven mobile devices at selected stations, in accordance with the positions of the control levers or push buttons of the corresponding table, such as that shown in FIG. 1C. When relay 234S attracts its armature, terminal B is connected, by its contacts d to h, to the contacts of the levers and, from there, to wires 39 to 45 going to the contacts of relays O1 to 07.

   The OCR relay having attracted its armature, the contacts f of the odd-numbered counter relays ensure connections passing through the NO contact d of the SP relay, the NO contacts e and of the OL1 and OLP relays in parallel with the NO contact e of the this; OCR to go to wire 61 and from there to the OT relay hold circuit whereby the OT relay can be kept energized until the OL1 and OLP relays open, thus producing the odd long elements of coded.

   The contacts f of the even counter relays establish the connections passing through the working contacts c of the OL2 and OLP relays in parallel and the working contact ± of the OCR relay to go to wire 62 and, from there, to the left terminal of the relay OT so that it can be kept open until. that the OL2 and OLP relays open, thus generating the long and even code elements, these circuits obviously only being available during the second operating cycle of the counter relays. In view of the similarity of these control circuits to those of the above-mentioned first patent, it was not considered necessary to make a detailed description here.



   When the 234S selector relay attracts its armature as described above, its contact 1 switches the direct connection from terminal B to the 234ST start relay hold circuit, to another with wire 46 and going to terminal B on the rest contact f of relay 08 and the result is

  <Desc / Clms Page number 23>

 that the start relay operates, such as 234ST, is released, for the eighth stage of the corresponding code. This has the advantage of allowing the start relay of any panel to be re-energized by momentary operation of the associated start button STP to store a second code for the transmission, even if the button is pressed before. that the first code is finished.



   During the reception of an indication code, the relay 08 and the relay S of the selected table are also energized, as in the case of the described command code, but then the receiving relay OM is not energized and its contact of rest g ensures a connection going from terminal B to wire 46 to prevent the opening of the start-up relay, for example relay 234ST, under the action of the operation of relay 08.



   When relay 016 attracts its armature during the sixteenth stage, which, due to the opening of the OT relay, is a line closing stage, terminal B is cut off with wires 68 and 18 on the normally closed contact. e of relay O16, a little before relay 07 opens to close its rest contact G. Consequently, relay OT remains open, relay OR remains normal and relay OM opens and then the syn relays - chronization OL2, OLP, OLB, OLBP and OL1 open in this order.



  The relay 016 which is kept energized on a restraint circuit comprising the wire 48 and the contact b of the OLB relay is de-energized when the OLB relay opens and it opens. The OLBP relay cuts terminal B of wire 60 thereby opening the CR and SP relays and the actuated selector relay such as 234S, after which the device is in the desired position to receive a new code. If another office start relay has been closed to store a command code, that code is energized when relay OL1 is opened, this relay being the last to be released.

   The sixteenth stage thus corresponds to the return of the cir-

  <Desc / Clms Page number 24>

 fired to its normally closed state and, in the case of successive code transmission, it represents a line closure stage which is materially longer than any other stage occurring in the code.



   If we now consider the operation of the station apparatus of Figures 2A, 2B and 2C when it receives a control code as just described, we see that the line relay R of each station and synchronization relays L1, L2, LP, LB and LBP operate in conjunction with the corresponding relays in the office. The counter relays of each station operate in the first eight stages in accordance with the counter relays of the office, while only those of the chosen station for which the selector relay S is closed which operate in their second cycle.



  In the first stage of the control code, an output control relay CD is selectively actuated due to the opening of the relay L1, due to the long nature of this stage, by a circuit from the terminal B of the switch contact. work a of relay LBP, passing through wire 160, rest contact d of relay Ll, wire 163, rest contact b of relay CR, contact c of relay 1, the upper winding of relay CD, for go to terminal C. Relay CD attracts its armature and closes a retaining circuit starting from terminal B on wire 160, passing through its contact a and the lower winding ,, to go to terminal C.



   As seen in Figure 2C, the station code unit contains a set of three selector relays FA, GA and S which can be adjustably wired to operate on any of the thirty-five calls from. code, the links as shown being arranged so that the relay S operates for the 234 code call. The circuits of these relays are generally similar to those of the selected relays.

  <Desc / Clms Page number 25>

 office contents already described. Those which work for even stages start from wire 160 to which terminal B is connected, they go through the work contact a, of the LBP relay (fig. 2A), the rest contact d of the relays 2, 4, 6 and 8 to go to threads 122,124, 126 and 128.

   As shown, a link with wire 122 provides a circuit for energizing relay FA in the second stage, relay FA comprising a hold circuit going to wire 160 through its own make contact a and a rest contact m of the GA relay. Those which are effective for the odd stages, start from wire 160 through the rest contact d of relay Ll, wire 163, the rest contact b of relay CR, work contact b of relay CD, work contacts d relays 3, 5 and 7 to go to wires 123, 125 and 127. As shown, a link with wire 123 gives a circuit passing through contact 12 of relay FA to energize relay GA, the holding circuit of which goes to wire 160 by its own NO contact and the NO contact a of relay S.

   Likewise, a connection going to wire 124 gives a circuit passing through contact b of relay GA in order to energize relay 8, the retaining circuit of which is connected directly to wire 160 by its own work contact a.



   It should be noted that the various selector relays F, G and S are actuated directly following the opening of relay L1 or L2 when the device is in the receiving state, as described, and accordingly, these relays are actuated before the completion of the long stages, thus giving a margin allowing for differences in timing.



   It will be understood that the relays FA of the different stations can be connected to any one of the wires 122 to 126 and the relays GA to any of the wires 123 to 127, below that to which the associated relay FA is connected. As a result, when the code call is 234, the FA relays, connected to wire 122,

  <Desc / Clms Page number 26>

 operate for the second long stage, the FA and GA relays connected to wire 125 operate on the third long stage and the FA and GA relays connected to the wire 124 operate on the fourth long stage, with the S relay of the unit d 'station storage chosen, but the selection is complete to close a relay S in only one place.

   In the other places, the operations of the counter relays end with the eighth stage and only the R line relay and the synchronization relays continue to operate for the rest of the code.



   At the chosen station, relay S prepares a closing circuit for relay CR, a circuit which is closed during the eighth stage starting from terminal B on contact d of relay S (figure 2C), passing through wire 146, contact f of relay S, relay CR, to go to terminal C and relay CR attracts its armature, its working contact has closed its retention circuit on wire 160. The working contact of Relay CR closes a link going from wire 119 to contact b of relay 8 to operate relay 1 in order, after relay 8.



   The ninth to fifteenth stages of the control code are used to control a series of polar latch type control relays, depending on the positions of the corresponding levers on the desk.



   Figure 10 shows a typical arrangement of such relays including a switch control relay WS and signal control relays LES, RHS and COS which can be used to control a lane change and an associated group of signals in the same manner. indicated in relation to Figures 8 and 9 of the first above-mentioned patent. However, in the current system, the control code has two additional stages providing control of two additional restraint relays, for example the FS and MCS relays shown.

  <Desc / Clms Page number 27>

 



   These polar restraint relays are actuated to normal or vice versa by pulses supplied by wires 149 to 155 inclusive, and they are placed under the control of the station code unit, by operation of the output relay D. Relay D at the selected station attracts its ar- rature at the ninth stage of a command code, by a circuit starting from terminal B on contact C of relay CR, (figure 2B), passing through the closed contact g of relay 8, the working contact c of relay CD, wire 115, the working contact g of relay S, relay D, to go to terminal C and it remains energized until 'at the end of the code.



   The circuits suitable for operating the polar restraint control relays, depending on the long or short nature of the ninth to fifteenth code stages, are obtained by operating two pilot relays P1 and P2 (FIG. 2A), the circuits of which are prepared. by closing the working contacts of the CR and CD relays. When relay Ll opens at an odd stage of the second cycle, it closes a circuit from terminal B on contact a of relay LBP, passing through wire 160, the rest contact 1 of relay Ll, wire 163, working contact b of relay CR, working contact H of relay CD, wire 109, the upper winding of relay Pl to go to terminal C.

   If the relay Pl attracts its armature, it is kept excited, for the duration of the next even stage, by a retaining circuit starting from terminal B on the left contact a of the relay R, passing through the make contact d of relay LBP, make contact a and the lower winding of relay Pl to go to terminal C, relay Pl opening when the left contact a of relay R is open, at the start of the stage. next odd. Likewise, when relay L2 opens at any even stage following the ninth, relay P2 is energized by the circuit starting from terminal B on wire 160,

  <Desc / Clms Page number 28>

 passing through the rest contact d of relay L2, wire 164, working contact d of relay CR, contact .1 of relay CD, wire 100 and the upper coil of relay P2, to go to terminal C .

   If relay P2 attracts its armature, it is kept energized for the duration of the next odd stage by a retaining circuit starting from terminal B on the right-hand contact to relay R, passing through the rest contacts e of the relay 16, the front contact b of the LBP relay and the front contact and the lower winding of the P2 relay, to go to the terminal
C, relay P2 opening when right contact a of relay R opens, at the start of the next odd stage.



   The circuits provided by the contacts of the relays P1 and P2 for controlling the polar restraint relays are of a large number of types, one of which is represented by the circuits of the relay W8, which is controlled according to the position of the switching lever SW of Figure 1C. When the SW lever is normal, the ninth stage of the control code is long and the eleventh is short, and when the SW lever is reversed, the ninth stage is short and the eleventh is long.

   If the SW lever is normal, the 1P relay attracts its armature at the ninth stage and when the R relay is actuated to the left to start the tenth stage, its contact 1 connects the terminal B to the holding circuit of the P1 relay, for the keep closed, and at the% contact of relay P1, to temporarily close a circuit comprising wire 111, the contact of relay 1, wire 149, contact a of relay B, the upper winding of relay WS, contact LR relay working position and terminal C, thus actuating the WS relay contacts to bring them to their left position, as shown. The WS relay is thus energized in the normal direction at the same time as the relay 2 by an impulse which ends when the relay 1 opens.

   At the beginning of the twelfth stage, the wire 111 is momentarily connected-

  <Desc / Clms Page number 29>

 via contact µ of relay 3, wire 151, contact c of relay D and the lower winding of relay WS to terminal C, but this has no effect since relay Pl is open at this time and that the connection of terminal B with wire 111 is open. Likewise, if the lever SW is reversed, the relay P1 remains open and the relay WS is not actuated at the ninth stage but receives an impulse in its lower winding to actuate and reverse at the eleventh stage.



   Another type of control circuit has been shown, that of the relay FS which is controlled by the key of the desk FB so as to be brought into the normal or reverse position depending on the long or short nature of a simple code stage. When the tenth stage is short, the P2 relay is in the open position when the R relay is brought to the right to start the eleventh stage and it then momentarily closes a circuit going from terminal B to the right contact of the relay. R, by the rest contact µ of relay P2, wire 156, relay FS, contact b of relay D, wire 150, contact t of relay P2, so that relay FS is brought to the left.

   When the tenth stage is long, the relay P2 attracts its armature for the duration of the eleventh stage and its contacts b and g reverse the direction of current flow in the relay FS and it is brought to the right. The circuits of the MSC and COS relays are likewise controlled by the P2 relay and the LES and RES relays by the P1 relay, each by a momentary impulse at the beginning of the stage following its assigned stage, i.e. according to the stage the nature of which controls the operation of the polar restraint relay.



  The LES and RHS relays are also provided with a local reset circuit which operates in a well known fashion to energize these relays in the normal direction due to the opening of the TR track relay.

  <Desc / Clms Page number 30>

 



   Two types of circuit have been described above for controlling polar restraint relays. In the first type, represented by the WS relay circuit, the pole restraint relay is only energized if the pilot relay P1 or P2 has attracted its armature under the action of a long stage and has not operated. ted if the stage is short. In the second type, represented by the circuit of the FS relay, the polar restraint relay is energized in one direction, if the assigned stage is long and, in the opposite direction, if it is short. There is also a third type, not shown which can be obtained by connecting any one of the relays to wire 158 or 159 going to the rest contact a of relay P2 or Pl (figure 2A), instead of going to wire 156 or 157.



  Assuming that one terminal of the FS relay is connected to wire 158 instead of being connected to wire 156 for example, its other terminal being connected to wire 112 as shown, we see that the FS relay is momentarily energized by the relay R only when the assigned stage is short, so that relay P2 remains closed. As a result, any of the pole restraint relays can be arranged to operate for a short stage but not when the stage is long.



   When one arrives at the sixteenth stage of the command code, the line relays R remain energized firmly and the synchronization relays L of each station open in accordance with the corresponding relays in the office and so are the relays. relay 7, 16, CR and S at the chosen station, the relay L1 being the last to open. Relay CD opens under Inaction of relay LBP, with relay CR, and then relay D opens, putting the device in the condition to receive a new code. Opening relay L1 puts the device in a state to initiate transmission of an indication code, assuming that the SS relay which will be described below is not energized.

  <Desc / Clms Page number 31>

 



   The station code apparatus of Figures 2A, 2B, and 2C is also suitable for transmitting indication codes which the office apparatus may receive. Each indication code has sixteen stages, the first of which is relatively short, from the second to the eighth they are arranged in different combinations of three long stages and four short stages so as to actuate the selective relays F, G and S of the office. and the station according to the various code calls, as already indicated, and the ninth to sixteenth stages can be long or short so as to indicate the status of seven mobile devices to the station by operation of a group of indication relay K of the table chosen from the office during the sixteenth stage of the code.



   A typical group of devices of this type has been represented in FIG. 2C in which we see a group of indicator relays comprising a TKS track storage relay, a KR approach relay, a POR power take-off relay, a NWP and RWP normal and reverse lane change repeater relay and two LER and RER signal control relays. The station apparatus is arranged so as to automatically start an indication code under the action of a change in the position of one of the indicator relays, each of these codes being stored for transmission, when the line circuit becomes available, by opening the start-up relay of the station ST of FIG. 2C.

   The ST relay is kept normally energized by a restraining circuit from terminal B on its front make contact a, passing through the break contact 2 of relay S, the winding of relay S, a work contact or c of each of the different indicator relays in series, to go to terminal C. It is also possible to manually initiate an indication code for transmission of a special "recall" code coming from the office with the help of which the

  <Desc / Clms Page number 32>

 ST relay can also be released, as will be seen below.



  Currently, objections were made to a normally excited starting circuit of this kind, since it was necessary to have a special setting of the indicator relay contacts to ensure the release of the start relay during the short time during which the circuit. is open when switching the contact from one position to another.

   This difficulty has been remedied in the circuits shown by using a sensitive relay of the polarized polar type, on the terminals of which an inductance 70 is mounted. The energy stored in the coil 70, when the relay ST is energized, gives an induced current source bringing the relay SP in its reverse position so as to open its retaining circuit under the faction of a sudden increase in the resistance of the circuit due to the displacement of one of the contacts e of the indicator relay, even if the time when this contact is really open is substantially zero and, consequently, it is not necessary to have a special setting of these contacts.



   The transmission of an indication code by the apparatus 2A, 2B, and 2C will now be described, assuming that the code is initiated due to the movement of a train on the line section 1T. The fall of the track relay TR opens the normally closed retaining circuit of the TICS relay going from terminal B to the N / O contact of the MSP relay, through the left contact d of the SP relay, the N / O contact a relay PR, relay TKS, to go to terminal C. Relay TKS opens, its contact c in turn opening the retaining circuit of relay ST which opens.



   If the line circuit is available, the start-up circuit closes going from terminal B, through the rest contacts b of the ST and SS relays, wire 147, contact b of the RP relay, the contact a of the COR cut-off relay, the connectors

  <Desc / Clms Page number 33>

 rest tacts b of relays Ll and L2 and relay M, to go to terminal C. Relay M attracts its armature by closing a temporary restraint circuit on its contact a, going to wire 147 through rest contact 2 of the LBP relay. Contacts B and D of relay M reverse the connections of relay R to the line wires Y and Z, the working contact d of relay M also closing a low impedance shunt going from line Y through the rest contacts of the terminals. CD and LPB relays, to line Z.

   The ± and g contacts of relay M now connect the LPF low pass filter capacitors across the line, so that during transmission these connections correspond to those of an office. Normally, the impedance mounted in the line, which the station apparatus comprises, is significantly increased as desired by disconnecting these capacitors.



   When the line circuit is shunted by the relay M, the associated line relay R opens and the increase in current supplied by the battery 80 causes the transformer RT (figure 1A) to provide a pulse actuating the relay OR for, reverse it appreciably in accordance with relay R.



   Relay R activates the associated synchronization relays and relay 1, the closing of contact 9 of relay LB closing the normal holding circuit of relay M, passing through wire 118 and the rest contacts e of relays 16 and CD, for go to terminal B.



   The OR relay operates the synchronization relays O, the relay 1 and the relay E as in the first stage of a command code and, in addition, a circuit is closed from the terminal B of the right contact to the relay OR, passing through the NC contact H of the OLBP relay, the NC contact b of the OM relay, the NC contact d of the Q16 relay, the PC relay, wire 17 and finally terminal C of contact a of the CB button. As a result, the PC relay attracts its armature and contacts B

  <Desc / Clms Page number 34>

 and D reverse the polarity of the current supplied to the line, while its contact g closes a circuit energizing a slow closing and slow opening PCP repeater coil.



   The abrupt variation of the line current, due to the operation of the PC relay, has no effect on the OR relay because when the PC relay attracts its armature, the secondary of the transformer RT is momentarily short-circuited on the work contact c of the PC relay and the break contact c. of the PCP relay and the lower winding of the OR relay is energized in the opposite direction by the circuit starting from terminal B of the NC contact b of the PCP relay, passing through the NO contact! of the PC relay, the rest contacts of the X, OM and OT relays and the DR relay, to go to terminal O.

   The PC relay is kept energized by a restraint circuit comprising its work contact and the work contact h of the OLBP relay, until the 016 relay attracts its armature when the OR relay returns to normal, at the end of the code.



   The shunt mounted on the Y and Z line wires, formed by the M relay at the transmitting station, as shown, also causes a short circuit and, as a result, opens the R line relays at the more distant stations. from the office. If the transmitting station is at a great distance from the office, it may be that the voltage on the line, which varies from appreciably the total voltage of the battery 80 at the office, to appreciably 0 at the place where the shunt is applied, remains sufficient to keep the R relays closed at stations near the office. However, these relays open by reversing the polarity of the line under Inaction of the PC relay.

   As a result, all the line relays R open substantially at the same time when a relay M attracts its armature to start a code, each relay R activating its synchronization relays and the first counting relay 1.

  <Desc / Clms Page number 35>

 



   At each of the stations where the relay M is not actuated, the relay R remains open by keeping the relay L2 energized but by letting the relay Ll open to close the relay CD and, then, the relays LP, LB, LBP , 1 and CD open in this order.



   At the transmitting station, the closing of the working contact e of relay M closes the pulsating circuit of relay T which goes from terminal B of neutral contact 2 of relay CD (figure 2B), via the reset contact e of relay 16 and the rest contacts G of relays 7, 5, 3 and 1, wire 168, contact e of relay M, relay T, resistors W6 and W7 to go to terminal C.



  Relay T transmits the code by operation of its contact b which is made effective when relay LBP attracts its armature in the first stage, to open its rest contact 'f in parallel with it. Each time the relay T attracts its armature, a low resistance shunt goes from line Y through the normally closed contact f of the CD relay, the working contact µ of the T relay and the working contact 12 of the M relay , to line Z and, at the same time, the circuit of relay R which now goes from the positive wire Z through the make contact d of the relay M, the normally open contact b of the relay T, the resistor W1, the relay R, the working contact b of relay M, to go to wire Y, is opened by relay T,

   which opens relay R more quickly than if it were simply short-circuited by the closing of make contact b of relay T.



   Although the first stage of an indication code is short compared to the first stage of a command code, it is slightly longer than the other short stages since it begins before the T relay attracts its armature. and the fact that relay T is kept energized until relay BB has attracted its armature, which occurs shortly after relay 1 has drawn its own due to a link - going from terminal B of the rest contact e of the LBP relay, through the rest contact d of the LB relay, to wire 168.

  <Desc / Clms Page number 36>

 



   The operation of the device at the transmitting station which is necessary to allow transmission to continue, also depends on the conditions in the office. Since the links of the relay R with the line have been reversed by the relay M, the relay R draws its armature to start the second stage only if the relay PC has been closed to reverse the polarity of the line current, this which indicates that the office device is in the correct reception state with the OM relay open.



   The code call stages of the indication code are generated by relay T in the same way as by relay OT in the command code already described. Assuming that it is 234, the second stage is prolonged by the closing of a retaining circuit of the relay T going from the terminal B, by the rest contacts ± of the relays ST, SS and-Se the rest contact g of the relay GA, the rest contact e of relay FA to wire 132 then, from there, via the contact of relay 2, the rest contact f of relay CR, wire 162, contact F of relay M and the rest contact ± from relay T to the left terminal, which bypasses relay T.

   During the second stage, the relay FA attracts its armature due to the opening of the relays L2 and LP and its contact passes the connection from terminal B to wire 132 on wire 133, opening the retainer circuit. of the T relay to allow it to attract its frame to begin the third stage. This is extended by the operation of the retaining circuit of relay T, going from terminal B, by the working contact ± of relay FA, to wire 133, then by contact c of relay 3, the rest contact of relay CR, wire 161, contacts and winding and working contact ± of relay T and resistor W7, to terminal C.

   In the third stage, the GA relay attracts its armature due to the opening of the relays

  <Desc / Clms Page number 37>

 L1 and LP and its contact g passes the connection from terminal B to wire 133 over wire 134 opening the retaining circuit of relay T to allow it to open and begin the fourth stage, which, like the second, is prolonged by the operation of a retaining circuit of relay T, the circuit of the fourth stage comprising the front left contact of relay GA, wire 134 and contact 2 of relay 4. In the fourth stage, the station selector relay S attracts its armature following the opening of the relays L2 and LP, the opening of the rest contact c of relay 8 allowing relay T to open to start the fifth Stadium.



   When the relay S attracts its armature, it closes the circuit of the MSP repeater relay, going from the terminal B of the work contact & of the relay M (figure 2A), through the wire 169, the contact b of the relay 8, the relay MSP, to terminal C. As a result, the MSP relay draws its armature into the stage corresponding to the last digit of the code call, remaining energized until the end of the code.



   Since the pulsating circuit for relay T, works the same as for relay OT already described, it is obvious that if relay S is energized in the fourth stage, the stages, from the fifth to the eighth, are short. Relay CR attracts its armature in the eighth stage through the circuit from terminal B, passing through contact d of relay S, wire 146, ± contact of relay 8, relay CR, to go to terminal C, the CR relay closing its retaining circuit on wire 160, by closing its make contact a.



   When the CR relay attracts its armature, it establishes a closing circuit for the normally excited starting relay SP starting from terminal B of the ± contact of the CR relay, passing through the working contact e of relay 8, the working contact h of relay M, wire 114, the working contact! of

  <Desc / Clms Page number 38>

 relay S, relay ST and coil 70 in parallel, then the make or break contacts ± of the TKS indicator relays, etc. to go to terminal C.

   The ST relay attracts its armature and establishes a temporary restraint circuit going from terminal B on its make contact a, through make contact e of relay S, wire 113, make contact d of relay LB, to wire 114 and then, as we said above, by relay ST and coil 70, to terminal C.



   In the eighth stage, the CR relay establishes links from terminal B to contacts b of the indicator relays NWP, TK, etc. of figure 2C, passing through contacts & to. g of the MSP relays, wires 139 to 146, being completed successively on contacts f of relays 1 to 7 during the eighth to fifteenth stages of the code, or on contact e of relay Ll and contact b of relay LP, in parallel, and the working contact of relay CR to go to wire 161, either by contact 1 of relay L2 and ± contact of relay LP in parallel, and working contact f of relay CR , to go to wire 162 and keep relay T closed or open, as the case may be,

   until the LP relay opens making these stages available to indicate the positions of seven indicator relays in the same location.



   When one arrives at the sixteenth stage, the relay R of the transmitting station attracts its armature, by energizing the relay 16 which opens its rest contact g to disconnect the terminal B from the wires 168 and 118. The relay T remains open and relay M opens reversing the links of relay R so that it operates only for line current of normal polarity. In the office, the OR relay is brought to its normal position by energizing relay 016, which, by opening its rest contact d, opens the PC relay, thus returning the polarity of

  <Desc / Clms Page number 39>

 line to normal so that the R relay remains strongly energized after the M relay has opened.

   The PC relay opens the PCP relay and the OR relay releases the OL2, OLP, OLB, OLBP and OL1 relays, in order.



   The OR relay remains in its normal position and it is not abject by the operation of the PC relay, because when this happens, the transformer RT is short-circuited to the rest contact c of the PC relay and the contact of e work of the PCP relay and the OR relay is kept energized in the normal direction until the PCP relay opens in the circuit going to terminal 0, by the lower winding of the OR relay, the rest contacts e of the OT, OM and X relays, the rest contact ± of the PC relay and the working contact a of the PCP relay to go to terminal C.



   The restoration of the line polarity to normal, by the PC relay, causes the line relay R of each of the other stations to attract its armature. At these stations, the relays L1, LP, LB and LBP attract their armatures and then the relays L2, LP, LB, LBP and L1 open in that order.



   At the transmitting station, even if relay M opens at the precise moment when the line polarity is restored to normal, relay R can be momentarily de-energized but, given that relay 16 is closed, its contacts d and 2 connecting the right and left contacts a and b, of relay R with each other so that the circuits controlled by relay R remain in the same state as if relay R had remained firmly energized. As a result, each station's sync relays open in order, substantially in line with those in the office and slightly ahead of those of other stations. The MSP relay is released by the M relay, the relay 16 is released by the LB relay and the CR and S relays are released by the LBP relay.

   When relay M

  <Desc / Clms Page number 40>

 opens, its rest contact h (figure 2B) connects wire 113, through the rest contact h of relay 1, to wire 114 so as to keep the temporary closing circuit of relay ST closed after relay LB s 'is open. When the relay S opens, the drop of its continuity transfer contact re-establishes the normal restraint circuit by which the relay ST is kept energized until there is a change in the position of the switch. 'one of the Indicator relays to start a new code.



     It can be seen that all the code apparatuses are brought back to normal and are placed in the suitable reception state before releasing the relays OL1 and Ll to put the system in a state to transmit a new code.



   A change in the position of one of the indicator relays may occur during transmission of the indication code just described. If this occurs before the transmission of one of the indicator stages from the ninth to the fifteenth, the ST relay is re-energized in the eighth stage and only one code will be transmitted. Since the ST relay hold circuit is open at the start of the ninth stage, the temporary hold circuit by which the ST relay is kept energized opens to cause a new opening if a change in position. of one of the indicator relays occurs as a result of the transmission of the eighth stage. As a result, a new indication code will be transmitted to indicate the new state.



   It may also occur, as a result of a fault, that the transmission is interrupted before the sixteenth stage is reached to restore the normal holding circuit of the ST relay. If there is a prolonged exposure in the operation of relay R after relay ST has closed its armature;

  <Desc / Clms Page number 41>

 the Ll or L2 relay opens by opening the LB relay. As a result, relay LB opens its contact before relay M opens in order to open relay SP and, consequently, put the device in a condition to retransmit the entire code when the line becomes available.



   Hitherto, in conjunction with starting relays of the normally excited type, as has been shown for example by relay S of United States Patent No. 2,273,231 of February 17, 1942, it has been necessary to provide a SP repeater relay which is brought back to normal at the end of a complete code so as to be sure that a code interrupted in one of the stages following that in which the starting relay has closed its armature, is retransmitted. This result is obtained according to the present invention, with the aid of a temporary hold circuit, as indicated above, in addition to the normal hold circuit for the station start relay ST.



   The operation of the office apparatus of Figures 1A, 1B and 1C will now be described when it receives an indication code. It is understood that the OR relay is actuated by the transformer RT to the right during each odd stage and to the left during each even stage and, consequently, it actuates these synchronization and counting relays in the sixteen stages, in concordance with the corresponding relays of the transmitting station.



   During the first stage, relays OL1, 01, E, PC and PCP attract their reinforcements as we have already said, as do relays OL2, OLP, OLB and OLBP, but relay OL1 does not open because the first stage is short. Selected relays F, G and S, from the office, draw their armatures into the stadiums corresponding to the digits of their station's code call. More particularly, under the action of the code call 234, the 2F - and 23G relays are actuated in stages two and three and the relays

  <Desc / Clms Page number 42>

 234S and SP in the fourth stage. In reception condition, the NC contact d of the OLP relay in the circuits of these relays is bridged by the NO contact! of the PCP relay, so that these relays are closed when the rest contact d of the OL1 or OL2 relay closes in the long stages.



   The excitation of the PCP relay also prepares a circuit going from the terminal B of figure 1A, by the working contacts c, of the relays OL1 and OL2, the working contact of the PCP relay, the wire 59, the contact of working c of relay SP, the upper winding of relay OCD, to terminal C. Since relay SP attracts its armature by the NO contact of relay OL1 or OL2, the circuit of relay OCD is kept open in the stage in which the S or SP relays are operating and it closes as soon as the OL1 or OL2 relay has drawn its armature at the beginning of the stage following the final digit of the station code call, that is to say in the fifth stage when the code call is 234.

   When the OCD relay catches its arm, it closes a retainer circuit passing through its contact and the bottom winding going to terminal B on wire 60.



   The OCR relay attracts its armature during the eighth stage as we said above. The work contact 1 of the PCP relay maintains the link going from terminal B on wire 60, through the rest contacts d of relays OL1 and OL2, to wires 63 and 64 after the OCR relay has drawn its armature and closed. working contacts b and d of the OCR relay prepares circuits going from wires 63 and 64 to the contacts of relays O1 to 07 so that a series of recording relays 9 to 15 are made sensitive to the nature of the stages of corresponding numbers of the code. This means that when terminal B is connected to one of wires 139 to 145 (figure 2C), by a contact of an indicator relay, the corresponding stage of the transmitted code is extended, and, in the office, the recording relays correspond-

  <Desc / Clms Page number 43>

 dants 9 to 15 attract their frames.

   If the ninth stage is long, for example, the OL1 relay opens by closing its rest contact b to establish a circuit going from terminal B of contact a of the OLBP relay through the ± contact of the PCP relay, the contact of rest d of relay OL1, wire 63, the working contact of relay OCR, contact 2 of relay 01, relay 9, to terminal C, relay 9 drawing its armature to close a retaining circuit going to the terminal B, on wire 60, by its work contact a and also closing its contact 12 to connect terminal B to wire 49.



   In the sixteenth stage, relay 016 attracts its armor by closing a circuit from terminal B passing through the working contacts of the OCR and OCD relays (figure 1B), the contact! from relay 016, wire 56, ± contact of selector relay 234S, associated output relay 234D, to go to terminal C. As a result, relay 234D is energized to actuate the group K indicator relays that it controls, in accordance with the positions of recording relays 9 to 15. Relay 234D opens the retaining circuits of relays K and prepares closing circuits for each of these relays, going through wires 49 to 55 to terminal B work contacts b relays
9 to 15 respectively, the position of which indicates the state of the indicator relays of the group controlling the transmission of the code.



   The opening of the rest contact d of relay 016, during the sixteenth stage, releases the PC relay which, in turn, releases the PCP relay. Releasing the PC relay restores the line polarity to the normal state, the OR relay being kept normal by the rest contact f of the PC relay and the working contact a of the PCP relay until the PCP relay goes off. opens, relay OR being disconnected from transformer RT by opening of the rest contact ± of relay 016. The office synchronization relays open at 1 in the normal order, relay OL1 being the

  <Desc / Clms Page number 44>

 last to open.

   The OLB relay releases the 016 relay which releases the 234D relay by reestablishing the holding circuits for the K indicator relays which are energized by wires 49 to 55. The OLBP relay releases the OCR, OCD, SP and 234S relays as well as the energized relays of group nine to. fifteen.



   In the above, it has been assumed that the code has been initiated by releasing the TR track relay, with relay 10 energized in the tenth stage and the TK relay in the sixteenth stage to turn on the TKE lamp and, also , if the TICS button is closed, to actuate the doorbell relay BR momentarily, through contact b of the TK relay, to actuate the doorbell BL at one time. If this code is repeated, the TK relay remains closed and the BL doorbell is not actuated, as can be understood.



  The TK relay make contact a provides a link from terminal B to energize the chart recorder style magnet PM, as is generally expected in such systems.



   To be sure that the PM magnet is actuated during every train movement in the controlled line section, even if the line circuit is not available for the transmission of the indication code after the section line has been released, a TKS storage relay is provided, as seen in figure 2C, a relay which is normally kept energized by a retaining circuit starting from terminal B on its working contact b and passing through the work contact a of relay TR and relay TKS, to go to terminal C.

   Releasing the TR relay, when a train enters section 1T, then releases the TKS relay to open its retaining circuit and to connect terminal B, through its rest contact b, with the% contact of the relay MSP, to enable the device to transmit a busy indication. The ST relay is released by the fall of contact c of the TKS relay and it opens its

  <Desc / Clms Page number 45>

 contact d in the closing circuit of the TKS relay from terminal B to the rest contact h of the MSP relay so that the TKS relay remains open until the busy line code is transmitted.

   During the transmission of this code, the rest contact h of the MSP relay opens before the closing of the contact d of the SP relay, which occurs during the eighth stage and, when the rest contact h of the relay MSP closes in the sixteenth stage, the TKS relay is re-energized provided the ST relay is closed, indicating that the busy line code has been transmitted and also provided that the TR relay has caught its armature. When the TKS relay attracts its armature, the opening of its normally closed contact c. releases the ST relay again to initiate a code indicating the free track state and, since the ST relay is extremely fast, the TKS relay drive circuit opens before it is fully closed to establish its retention circuit.

   A relatively large capacitor C1 accumulates sufficient energy to prolong the energization of the TKS relay until its front contact b closes to establish its restraint circuit, under the condition indicated.



   The TKS relay also controls a circuit for restoring the control relays for the polar restraint signals to normal when a train enters a section of line, to release the TR relay and prevent the automatic opening of the signals when a train leaves the section of line, no additional repeater relay being necessary, this circuit going from the terminal B of the rest contact b of the relay TR, through the contact a of the relay TKS, the lower windings of the relays LES and RHS in series, at terminal C.



   We will now describe how the system is brought back to normal in the event of a fault.

  <Desc / Clms Page number 46>

 



   A command code may end on an odd stage due to a fault, with the OT relay being kept energized by wire 68, for example. The OR relay is then kept inverted until the OL1, OLP, OLB and OLBP synchronization relays open, the OL2 relay remaining energized. Relay
OLBP opens the OM relay and opens the circuits of the counting and selection relays. Opening the OM relay with the OR inverted relay allows the PC relay to attract its armature. OM relay also releases OT relay and PC relay closes PCP relay.



   At each station, relay R remains open and the synchronization relays open in the same order, the relay
OL2 remaining excited. The LBP relay opens the count and select relay circuits to prevent a new reception. Covering the OT relay closes the line circuit but the R relay does not attract its armature because the polarity has been reversed by the PC relay.



   When the PCP relay attracts its armature, the OR relay is brought to normal by the circuit going from terminal 0 through its lower winding and the rest contacts e of the relays
OT, OM and X, the NO contacts f and ± of the PC and PCP relays, the NO contact ± of the OL2 relay and the normally closed contacts f of the OLBP and OLB1 relays, at terminal C. Therefore, the relays synchronization are re-energized and the PC relay is de-energized, the PC relay opening before the OLBP relay closes. As a result, the office synchronization relays open in the normal order due to the de-energization of the OL2 relay and the PCP relay also opening, the OL1 relay being the last to open.



   When the PC relay opens, it restores the line polarity to normal so that all R line relays attract their armatures in correspondence, re-energizing their

  <Desc / Clms Page number 47>

 synchronization relay and the latter then open in the normal order at each station due to the de-energization of relay L2, relay L1 being the last to open.



   If a command code ends on an even stage before the sixteenth because an OT relay has not drawn its armature, the OR relay is kept in the normal state and the synchronization relays open in normal order, the OLBP relay opening the circuits of the counting and selection relays and also opening the OM relay, the OL1 relay being the last to open. The station line relays remain firmly energized and their timing relays open in the normal order, such as at the end of a full code, with the L1 relay being the last to open.



   If a code indication ends on an odd stage, as it would, for example, if the T relay remained closed due to a fault, the OR relay remains inverted until the OLBP relay opens , the relay OL2 remaining with its armature attracted. The OR relay is brought back to normal by closing the NO contact of the OLBP relay in the circuit indicated above which comprises the NO contacts of the PC, PCP and OL2 relays and the NO contacts f of the OLBP relays and OL1.



   At the transmitting station, relay R remains open and synchronization relays Ll, LP, LB and LBP open. Relay LB opens relay M which opens relay T and removes the shunt formed by relay T and also reverses the connections of relay R, so that the latter remains open, the device taking the same state as in the other stations where the R relay and the synchronization relays remain open, with the R2 relay closed.



   When the R relay returns to normal, the desktop synchronization relays are re-energized and the PC relay is

  <Desc / Clms Page number 48>

 de-energized and opens before the OLBP relay has drawn its armature. The office synchronization relays then open in the normal order, the OL1 relay being the last to open.



   When the PC relay opens, it restores the polarity of the line to normal so that all the R line relays attract their armatures in correspondence by re-energizing their synchronization relays and the synchronization relays of each station. then open in the normal order, the relay L1 being the last to open.



   If an indication code ends on an even number before the sixteenth because an OT relay has not drawn its armature, the OR relay remains in the normal state until the synchronization relays OL2, OLP, OLB and OLBP open, the closing of the rest contact f of the OLBP relay closes a circuit used to actuate the OR relay to bring it in the opposite direction, starting from terminal B of the contact working d of the PCP relay and going through the rest contacts f of the OL2 and OLBP relays ,. the working contact b of the PCP relay, the working contact f of the PC relay, the neutral contacts of the X, OM and OT relays and the OR relay, at terminal 0.



   At the transmitting station, relay R remains closed and synchronization relays L2, LP and LB open. Relay LB opens relay M and reverses the connections of relay R so that relay R opens by re-energizing the synchronization relays which then open in the order L1, LP, LB and LBP, l ' device resuming the same state as in the other stations where relay R and synchronization relays remain open with relay R2 closed.



   In the office, the OR relay is inverted when the OLBP relay opens and, since the PC relay closing circuit is closed when its hold circuit opens, the PC relay remains closed. Office synchronization relays

  <Desc / Clms Page number 49>

 are re-energized and then open in the order OL1, OLP, OLB and OLBP, the relay OL2 remaining closed. The OR relay is returned to normal when the NC contact closes! of the OLBP relay on the circuit indicated above which includes the work contacts of the PC, PCP, and OL2 relays and the closed contacts of the OLBP and OL1 relays. When the OR relay is brought back to normal, the office synchronization relays are re-energized and the PC relay is de-energized, the PC relay opening before the OLBP relay opens.

   The office synchronization relays then open in the normal order and the PC relay restores the line polarity to normal to close the station line relays, the station synchronization relays being re-energized and opening in the normal order as in the previous examples.



   It can be seen that, in each case, whatever their initial positions, the line relays OR and R are all brought back to normal approximately at the same time, so that each releases its synchronization relays in order. normal to place all code systems in the proper receive state before relay OL1 or any of the relays L1 opens to allow booting of the next code. In general the office has priority to send the following codes because the relay OL1 opens a little before the relays L1 open.



   It has already been said that if, due to a fault, an indication code is interrupted after the station restart relay ST has been re-energized, the relay ST opens again due to the opening of relay MB, before relay M opens. It is clear, therefore, that each interrupted indication code is restarted to be retransmitted in its entirety once the line is again available. This is only true of a command code in the event that the interrupt occurs before the office switch-on relay

  <Desc / Clms Page number 50>

 has opened, as occurs in the eighth stage of the station code call, otherwise it is necessary to perform a second command with the STB start button.



   It can also happen that the OR relay is actuated by one or more pulses of foreign current as happens in the case where a temporary line crosses or opens when the system is in its normal rest position. In this case, the first inversion of the OR relay closes the PC relay, reversing the polarity of the line and releasing the R line relays to prevent a code from being activated at a station. When the interference is over, the system returns to normal in the same way as in the case of a interrupted indication code as described above.



   Devices for preventing interference by transmitting the indication codes, one at a time, in the desired order, when two or more transmitters have codes stored for transmission will now be described. The insertion of relay contacts L1 and L2 in the closing circuit of each of the relays M and of the analog relay circuit OM, prevents the activation of a code except when the line is free as it is. 'has already explained, but it can easily happen that the office and one or more of the stations emit codes substantially at the same time.

   If the OM relay attracts its armature, the command code takes precedence since the rest contact b of the OM relay opens the PC relay circuit and the long open line stage, generated by the OT relay, main- keeps the R line relays open to close the incoming CD control relay at each station, as in the command code already described. At each station where relay M has drawn its armature to start an indication code, terminal B remains disconnected from wires 118 and 168 and relay M is opened due to the opening of the rest contact e of the CD relay.

  <Desc / Clms Page number 51>

 



   Accordingly, all of the station code units are in a condition to receive the first stage control code, the indication codes being stored for subsequent transmission.



   In the event that the code units from two or more places start indication codes at the same time and by their joint action put the office code unit into the receiving state, the shunts applied to the line by the T relay which is closest to the office would control the operation of the R line relays at more distant locations as well as that of the same location and the T relays would operate in concordance as long as the corresponding stages of the respective code calls are the same nature.

   When a T relay maintains a shunt applied on the line to generate an unexpected long stage, it overrides any relay which opens in a more distant location for which the code call requires a short stage and when the T relay of the neighboring station closes to apply a shunt on the line, ending a short even stage, it overrides any relay which is kept lowered at a more distant station as required by a long stage .

   In each case, the R and T relays at more distant locations occupy their open position simultaneously for one of the station code call stages for a sufficient time to energize an opening circuit from terminal B of the contact. on the right a of relay R (figure 2A), passing through the rest contact e of relay 16, the open contact b of the LBP relay, the wire 119, the rest contact d of the relay T, the open contact j of the relay 'M, wire 166, the rest contacts i of relay CR and g of relay 1, the CD transmission control relay to go to terminal
C. Consequently, the CD relay attracts its armature and, by opening its rest contact e, it disconnects terminal B from wires 118 and 168 by releasing the associated relay M.

   Given that the line is now supplied with current of the opposite polarity, opening relay M makes the associated relay R of the

  <Desc / Clms Page number 52>

 more distant station not sensitive to the remainder of the code, by causing the synchronization relays L and the energized counter relay of this station to open, its code being stored to be transmitted then when the line is free again.



   We see, therefore, as regards the action of the line, that an odd long stage wins over a short and that an even short stage wins over a long one. For this reason, it is good to give the code calls from different locations the geographic order so that each call is higher than those farther away and lower than, those from stations closer to the office.

   Regarding the action of the line, the order of superiority of the code calls is ;, therefore, the following:
 EMI52.1
 
 <tb> 357 <SEP> 368 <SEP> 578 <SEP> 458 <SEP> 235 <SEP> 257 <SEP> 268
 <tb>
 <tb> 358 <SEP> 345 <SEP> 567 <SEP> 456 <SEP> 237 <SEP> 258 <SEP> 245
 <tb>
 <tb> 556 <SEP> 347 <SEP> 568 <SEP> 478 <SEP> 238 <SEP> 256 <SEP> 247
 <tb>
 <tb> 378 <SEP> 348 <SEP> 678 <SEP> 467 <SEP> 236 <SEP> 278 <SEP> 248
 <tb>
 <tb> 367 <SEP> 546 <SEP> 457 <SEP> 468 <SEP> 234 <SEP> 267 <SEP> 246
 <tb>
 
It can be seen that a different order prevails when the codes are transmitted from the same location, in which case a long stage wins over a short stage. For example, if all the power buttons on the office were pressed at the same time, the code call 234 would be the first and 678 the last to be transmitted.



   It is sometimes good to use code calls with the first digit of 2 in places other than in the normal order given by the table above. To allow this, we can use the variant of Figure 5 in which a secondary transmitter relay TS is provided in the control desk.



   In this variant, the station code calls are preferably limited to those for which the first digit is 2 or 3, in order to give sufficient time for the operation of the TS relay. This relay operates, when the

  <Desc / Clms Page number 53>

 OR relay, to start the third stage but only if a short second stage is received and it serves to open the line circuit on the third stage to oust any station that tries to transmit a short second stage. As a result, code calls with a long second stage, that is, those with the first digit of 2, keep their lower status, whereby stations using them can be evicted regardless of the number. 'geographic location of these stations.

   As a result, they can be used in locations closer to the office or scattered among other stations or on a branch line or at points opposite direction from the office, without interference with the use of the station. line by stations with 3 as the first digit of code calls.



   In all of these arrangements, it is understood that the code calls comprising the same first digit are assigned in the order given in the table to the stations of the group.



   It is understood that the view of Figure 5 is similar to the corresponding part of Figure 1A. except as regards the addition of the TS relay and its excitation circuit, this arrangement being an improvement over that of FIG. 8 of the aforementioned patent no. 2,303,875.



   When two stations start indication codes at the same time, one having 3 as the first digit and the other 2 as the first digit, the first wins and the OR relay is actuated to come to the right after a corresponding time. - laying in a short second stage thus completing a circuit momentarily at the beginning of the third stage of the code received starting from terminal B of the right contact a of the OR relay, passing through the working contacts g of the PCP and 2 relays, the working contact m of relay E, relay TS, to go to terminal C.

  <Desc / Clms Page number 54>

 



   The TS relay attracts its armature then opens, its circuit being open when the 02 relay of the same stadium opens. Contacts b and d of the TS relay open the line circuit for sufficient time to open the line relay.
R to the station transmitting the second long stage and to make effective the blocking circuit of this station, as described above, to stop the continuation of the transmission from this station and the ± contact of the TS relay disconnects the relay OR with the transformer RT to prevent its normal operation under the action of the interruption of the line current by the relay TS.

   When the TS relay opens, closing its rest ± contact allows relay 02 to receive a reverse current pulse from the RT transformer but as this only happens during a third long stage, when the RT relay is in reverse position, this has no effect.



   It is understood that under the action of the third long stage, a first selector relay 3F is closed on wire 23 (FIG. 1C) by releasing the relay E whose contact n keeps the circuit of the relay TS open for the remainder of the code.



   It can be assumed that the station that was evicted, as described above, then transmits its code in order.



   The TS relay is not actuated during reception of a code in which the first digit of the code call is 2 for the reason that the first selector relay 2F is actuated and, as a result, the relay E opens during the second stage long this code so that when the OR relay reverses to start the third stage, the TS relay circuit is open on the m contact of the E relay.



   In order to give greater security against the transmission of indication code from two stations at the same time in the event of a fault, it is provided at the office a relay

  <Desc / Clms Page number 55>

 additional blocking X, in accordance with a characteristic of the invention.



   Relay X is used to interrupt transmission in the event that a code call is received, containing more than three digits.



  For example, it can be assumed that one station can send the code 235 call and another the code 245 call at the same time. If this happens, the selector relay 2345 is actuated in the fourth stage to select a table that does not belong to any of the stations and the OCD relay (figure 1B) is actuated in the next stage, the fifth in this case, as on said it above. When the OCD relay draws its armature, its contacts b and d change the connections of the wires 53 and 64 of the contacts d of the counter relays to go to wire 57 and, if the fifth stage is long, it goes. establishes a circuit going from the terminal B of the rest contact d of the relay OL1 through the wire 63 to the wire 57 and the relay X to the terminal C, the relay X drawing its armature to close a retained circuit on its contact a.

   Relay X also attracts its armature at the seventh stage through the indicated circuit if this is the fourth digit of the received code call. The relay X can also attract its armature in the sixth stage through the circuit going from terminal B, through the normally closed contact b of the OL2 relay, the 64 wire, the closed contact d of the OCR relay and the closed contact d of the OCD relay to wire 57.



  In the eighth stage, the OCR relay attracts its armature, opening the circuits shown above to prevent operation of relay X during the second operating cycle of relays 5, 6 and 7 and it prepares a circuit for use in actuate relay X in the event that this stage is the fourth long stage of a received code call, this circuit going from terminal B through wire 64 to the working contact d of the OCR relay, the working contact e of relay 8 and the working contact d of relay OCB, wire 57 and relay X, to terminal C.

  <Desc / Clms Page number 56>

 



   As a result, if a code call is received containing more than three long stages, relay X draws its armature on the fourth of the long stages received. When relay X attracts its armature, it opens the line circuit on its contacts b and ± to open the line relays of the transmitting stations, if these have attracted their armatures, interrupting the indication code. . The opening of its normally closed contact disconnects the OR relay from the RT transformer and the closing of its working contact connects the OR relay to terminal C to bring the OR relay to the reverse position.



   The OR relay is kept in the reverse position by the X relay until the OLBP relay opens, which causes the X relay to open and the OR relay returns to its normal position by means of the circuit already indicated which includes the work contacts of the PC, PCP and OL2 relays and the open contacts f of the OLBP and OL1 relays. All R line relays and all station synchronization relays, except L2 relays, now remain open due to the reverse polarity of the line current, the M relays of the transmitting stations having been opened by operation of the line current. X relay. When the OR relay is returned to its normal position, the desktop synchronization relays are re-energized and the PC relay is opened, with the desktop synchronization relays opening in normal order.

   Opening the PC relay restores the polarity of the line to its normal state, so that the R line relays attract their armatures by re-energizing their synchronization relays and the synchronization relays of each station then open in the line. normal order.



   It is clear from what proceeds that there is no interference when a number of ST start up relays in the office and at stations open at the same time or when the line is in service. and that the codes are

  <Desc / Clms Page number 57>

 transmitted one at a time in order, according to the relative superiority of their respective code calls.



   The system according to the invention also comprises devices preventing the stations whose code calls have priority from monopolizing the use of the line in conditions of intense traffic or in the case where the start-up relay ST station does not attract its armature at the end of a code and this has a station suite SS relay in each station storage unit. The SS relay is used to prevent starting a second indication code by a storage unit of a station which has transmitted a code as long as a storage unit of another station has a code stored for it. 'program. This device is an improvement of those provided for the same purpose in United States Patents n.



  2,273,231 and 2,273,383 both of February 17, 1942.



   It can be seen in Figure 2C that the SS relay draws its armature into the stage representing the third digit of the station code call, by the make contact h of the MSP relay and the SS relay is then kept energized on a restraint circuit comprising its own work contact a and the rest contact la of the associated output relay D, wire 165 going to terminal B of the work contact f of relay L1 or L2, circuit which is opened by the Ll relay when the system takes its normal rest position at the end of a code.

   The SS relay is slow opening and its rest contacts b and 2 keep the start circuit open as well as those which control the transmission of the code call from the stations during an additional time interval during which a another station can start a code and thereby keep the SS relay closed. As a result, when the SS relay has drawn its armature, the station code forming unit is rendered incapable of starting a second code as long as the line

  <Desc / Clms Page number 58>

 has not been released for a time which is longer than the normal interval between successive codes. Each storage unit in which a code has been stored and whose SS relay has not been actuated has access to the line when an L1 relay is opened at the end of a coded.

   As a result, each of these storage units transmits a code and during this time its SS relay is energized. At the end of this series of codes, a longer time elapses to allow the SS relays to be released after which the station units are again in a state to transmit codes, one at a time, in the order.



   In the event that a command code is interposed in an indication code sequence as described above, to actuate a particular device, if the SS relay of the station unit controlling this device has attracted its armature, it opens by operation of the arrival relay D under the action of the control code and the unit is thereby enabled to indicate more rapidly the state of the device actuated.



   It is also obvious that each of the SS relays also serves to prevent incomplete codes from being continued by a station storage unit due to a fault, if other units have codes stored for transmission, provided that the fault is not of such a nature as to prevent the SS relay from being energized like this. This would be the case, for example, if the code transmitted by a station code unit having a higher code call does not progress sufficiently to attract the armature of the station relay S to that station due to a fault.



   To provide protection against this eventuality and others, a thermal relay COR is provided, arranged as shown in FIG. 2A. The COR relay is energized whenever a code indication is initiated by a storage unit from the moment the ST start relay opens - to start the code until the code either completely

  <Desc / Clms Page number 59>

 issued. The SS relay attracts its armature under the action of the MSP relay at the station selection stage of the code and until the SS relay has drawn its armature, the COR relay is energized by the circuit from terminal B passing via the rest contacts b of the ST and SS relays, wire 147, the working contact b of the RP relay, the COR relay, to go to terminal C.



  When the MSP relay attracts its armature, it remains energized until the end of the code and ensures a connection from terminal B to wire 147 on its make contact j to energize the COR relay.



   The energization time of the COR relay may exceed the time required to transmit a code from the associated storage unit, even if there is no fault, by the time required to transmit a code from the associated storage unit. a storage unit having a higher code call, an interval which in practice but seldom exceeds one minute. On the other hand, in the event of a fault which prevents the re-energization of the relay ST, the relay COR is energized substantially continuously. The COR relay is made selective on the action of a fault by adjusting it so as to open its contact a after it has been energized, after an interval of about two minutes, the opening of its contact a de-energizing its heating element and also the closing circuit of relay M.

   Contact a of the COR relay is of the snap action type and it remains open for about two minutes and after reclosing; if terminal B remains connected to wire 147, it operates cyclically with closing periods of one minute and opening periods of about two minutes.



  As a result, the COR relay operates in such a way that it prevents a faulty line arrival transmission for periods of about two minutes during each three minute interval as long as the fault persists.



   The system according to the invention also comprises an RPP fault relay by means of which it is possible to easily isolate from the

  <Desc / Clms Page number 60>

 line a station code unit, as is useful for example in the case of a short circuit in the line links or in the case of faulty operation due to an abnormally low voltage of the local battery or for terminate cyclic operation of the COR relay. The RPP relay is slow opening and is kept normally energized by a repeater restraint relay RP of the line relay R. The relay RP operates according to the code operation of the relay R as long as the RPP relay remains closed.

   During normal system operation, relay R remains permanently open for a maximum of about three seconds which is the time required to transmit an indication code from another station.



  The RPP relay opens sufficiently slowly to bridge this time interval by connecting the electrolytic capacitor C2 to its terminals. The energy stored in capacitor C2 ensures an opening period of about five seconds so that the RPP relay does not open, unless the R and RP relays remain closed for an abnormal time as would be the case. if there is a short circuit between the make and break contacts d of relay M, for example.



   Each station's RPP relay can be opened by hand from the office by pressing the DB disconnect button in Figure 1A, for a suitable time, for example fifteen seconds, thereby releasing the R, RP and RPP relays in the 'order. When the BPP relay opens, the resistor W1, in series with the relay R, is short-circuited by its contact b and, at the same time, the contact a of the RPP relay opens to interchange an analog resistor W8. in the circuit of the relay R at a point close to the line wires Y and Z.

   As a result, if the system has become inactive due to a short circuit in the code unit, the fault in the line is removed by inserting a relatively high resistance in series with it,

  <Desc / Clms Page number 61>

 the resistors W1 and W8 having, in general, in practice, a value of about 10,000 ohms each. The transmitting part of the code unit is thus effectively isolated from the system and, at the same time, the starting circuit comprising the wire 147 opens on the contact b of the RP relay to prevent a new energization. COR and M.

   At each station where there is no fault, the relay R attracts its armature under the action of the release of the disconnection button BB since, with regard to this relay R, the effect of the opening of relay RPP simply has the effect of replacing resistor Wl with an equivalent resistor W8, in its circuit. However, relays RP and RPP remain open after relay R has been energized, with relay circuit RP being open on contact c of the RPP relay and that of the RPP relay on contact a of the RP relay.



   The operator of the control desk can now put the system back into operation, leaving one or more station units isolated, transmitting control codes successively to each of the code units he wishes to include in the system. as it is restored. In the ninth stage of a command code, as described above, closing the normally-open contact e of relay 8 establishes a link from terminal B to wire 115 to close a circuit for output relay D of l. chosen storage unit. A connection from wire 115 and through the lower winding of the RP relay constitutes a circuit for the RP relay to attract its armature and in turn energize the RPP relay to complete the RP relay hold circuit. thus returning the code unit to its normal operation.

   It is obvious that a command code is not received at a station where the relay R is short-circuited, for example, and that consequently this station remains isolated.

  <Desc / Clms Page number 62>

 



   To facilitate the re-establishment of the system as described above, there is provided at the desk an RCB "callback" button (figure lE) by means of which the operator can send a special callback code to any station without activating none of the station's devices, this callback code being terminated after the station code call has been transmitted, ie on stage 9. The callback code is also used to start the transmission an indication code from the chosen station and this gives the operator the means to obtain new indications without causing any change in the state of the station devices.



   To start a recall code, the operator presses the RCB recall button and also the STB start button on the control panel for the station to which the code is to be sent. Therefore, the corresponding start relay such as 234ST attracts its armature and this relay, in turn, closes the OL relay as already said, which establishes a circuit going from the terminal B of the contact of OM relay work through wire 69, the contact of the RCB button, the RCR pullback restraint relay, to terminal C and the RCR relay attracts its armature by closing a restraint circuit passing through its work contact a and the wire 82 to go to terminal B on the working contact g of the OLBP relay.

   The RCB button can then be released and transmission continues in eight stages during which the office selector relays 234S and the corresponding relay S of the chosen station are energized as in the command code already described. When one arrives at the ninth stage, the relay 01 does not attract its armature, its circuit being open on the rest contact b of the RCR relay and, consequently, the relay OT is kept energized by the wire 168 until that the OLBP relay of the office and the LBP relay of the chosen station open.

  <Desc / Clms Page number 63>

 



   At the chosen station, when relay S attracts its armature, the normal holding circuit of relay ST is replaced by the temporary holding circuit going from wire 113 to 114, by the rest contacts h of relays M and 1 and in parallel with them, the working contact b of relay LB. When relay 1 attracts its armature at the ninth stage, the circuit is opened due to the opening of the LP relay. Relay D also attracts its armature during the ninth stage, by wire 115, the opening of its rest contact h causing relay SS to open if it was energized. Consequently the station code unit is enabled to start an indication code as soon as the line is free again.

   It can be seen that during the ninth stage of the recall code, the RCR relay is opened by the OLBP relay and that the system is then in the same state as when the control code is interrupted on an odd stage due to a fault. As a result, the system is brought back to normal by the same sequence of operations as that described above.



   In the foregoing description of the operation of the system stage by stage, it has been assumed that there is only one storage unit associated with each code unit, as shown in FIG. 2C. It is customary to place a storage unit in the box containing the station code unit, because at least one is always needed, and to provide terminals for connecting, to the code unit, a or several auxiliary storage units each comprising a housing comprising a group of five relays, S, MSP, ST, D and SS when the number of devices to be controlled or indicated exceeds the capacity of one storage unit and identify relays that are analogous to each other by setting code call numbers for the designation of the storage unit relays.

   For example, the relay S in Figure 2C selectively responds to the code call 234 and can be called 234S

  <Desc / Clms Page number 64>

 like the office relay which corresponds to the same code call.



  The relays S of the four auxiliary storage units, designated 2358 to 238S can then be connected to the contacts c to f of the relay GA as seen in particular on the left part of figure 3. In this regard case, a rest contact from each. of relays 2348 to 238S is included in the holding circuit of the GA relay so that the GA relay opens under the action of the last digit of one of the code calls 234 to 238 as necessary .



   Each auxiliary storage unit also requires a link starting from contact C of its relay S to go to a different contact g to k of relay GA to perform the formation of its own code call, as indicated by the references. - references 234 to 238 adjacent to these contacts in FIG. 3. The remaining links, going to each auxiliary storage unit, are arranged like those shown.



  * This means that the remaining wires going to the station code unit, are bus wires connected to the corresponding number terminals of each of the storage units in succession.



   When the storage units in a group are linked directly to the station code unit, as described above, the FA relay can be controlled in any of the two through five stages and the relay GA in any of stages three to six depending on which one the FA relay has been assigned to, as shown in Figure 2C. The number of storage units that can be ordered in this way is limited to a single group of two to five using code calls which differ only with respect to the third digit and there are ten of them. these groups.



   In a second arrangement, one can interpose one or more pyramid-shaped units UB, each comprising two Bêlais such as FB and GB of FIG. 3, between the code unit

  <Desc / Clms Page number 65>

 and one or more additional groups of storage units using code calls all having the same digit.



  When this second arrangement is used, the circuits are arranged so that the excitation of the relay FK establishes a communication starting from the terminal B on its work contact c to energize the relay FB of each pyramid unit in the same stage and we interpose a work contact of each of the FB relays and a rest contact of each of the GB relays in the FA relay holding circuit, the circuits controlled by the FB and GB relays being, at other points of vue, analogous to those controlled by the FA and GA relays as described above.



   It will be understood that when the FA and GA relays are connected to operate on any two stages of group two to seven as described above, one GB relay can be controlled in each successive stage of that group. As shown, relay GB is connected by contact b of relay FB to wire 124, to operate on the fourth stage, and it controls relay group S using code calls 245 to 248. Relays GB of three additional pyramid units (not shown), can be connected in a similar fashion, by contacts of their respective relays FB, to wires 125 to 127 to operate on stages 5 to 7 to control other groups of S relays using code calls 256 to 258, 267 and 268 and 278, respectively.



   In a third arrangement, the capacity of the code unit is increased in a different way by interposing one or more UC pyramid units, each comprising a group of three relays EC, FC and GC, to allow the use of calls. code with different first digits.

   When using this third arrangement, the circuits are arranged so that each EC relay is connected to wire 121 and

  <Desc / Clms Page number 66>

 attracts its armature at the first stage of the code, in accordance with the office relay E by an analogous circuit and it is kept energized by a retaining circuit connected to terminal B by its own contact ael wire 160 this circuit comprising the idle contact d of relay FA and each of the FC relays so that the BC relay opens when the first digit of a code call is received.

   The working contacts 6 and d of relay E as shown are interposed in the links going to wires 132 and 133 and the FC relay is connected by contact b of relay EC to wire 123 to operate on the third stage in case the FA relay is not activated on the second stage and it makes the GC relay sensitive to the fourth stage to control the group of relays S using the calls, code 345 to 348 as shown. Three other UC units with their FC relays controlled by stages four through six can also be provided to use code calls 456 to 458, 567 and 568 and 678 respectively.



   Each FC relay can also control one or more UB pyramid units, as represented by the UD unit, whose FD and GD relays are controlled by the FC relay by circuits analogous to those by means of which the FA relay controls. the FB and FG relays as described. If the FC relay is controlled in stage 3, the GD relay can control a group of S relays using code calls 356 to 358 as shown.



  Five other pyramid-shaped units arranged in the same way allow the use of code calls 367 and 368, 378, 467 and 468, 478 and 578 respectively.



   As a result, it is obvious that any or all of the thirty-five code calls can be used in one place by interposing one or more pyramid units between the code unit and the storage units. as described above.

  <Desc / Clms Page number 67>

 



   Referring to FIG. 4, this represents a variant of the code unit of the office allowing the simultaneous use of the line wires Y and Z of the time code system according to the invention, with a control circuit. dispatcher telephone fitted with call selectors. As shown, the selector system is that described in United States Patent No. 1,343,256 of June 15, 1920 having a number of J code wheels, only one of which is shown, with the aid of which the dispatcher. can transmit pulse codes so as to selectively call different track stations in order to get in touch with them by telephone.

   Each wheel :; code J. when it is rotated and released makes a turn during which a connector relay JB is energized to connect a source of direct current, by the contacts of an inverting relay. JPC pole sensor, at the primary of a JT pulse transformer, and, when the code wheel turns, the JPC relay is energized intermittently on a circuit having a contact operated by the code wheel to provide a code. 'pulses of alternately opposite polarities to the JT transformer.

   The modifications to the office code unit shown in figure A include the addition of a JBA connector relay, energized in parallel with the JB relay, a JBAP repeater relay, an MP restraining repeater of the main relay of office OM and a circuit comprising a wire 67 used to control the relays ST for starting the office. From the other points of view, the circuits are analogous to those of Fig. 1A and the normal operation of the time code control system is analogous to that already described in detail.



   The dispatcher is free to release a code wheel at any time to transmit a selector code, whether or not the line is occupied by the code system in time. Releasing the code wheel will energize the JB and JBA relays and the JBA relay or-

  <Desc / Clms Page number 68>

 then turns its contact a in the OM and PC relay circuits and closes its 0 contact to establish a circuit going from terminal B to the rest contact ± of the MP relay, through the JBAP relay, to terminal C so that the JBAP relay attracts its armor.

   The opening of the rest contacts] 2 and d of the JBAP relay disconnects the battery 80 from the line wires Y and Z and the closing of its make contact established the secondary circuit of the JT transformer to allow the selector code d 'access the line, the code wheel J being arranged such that the first operation of the code emitting JPC relay is delayed by at least one second after the JPC relay has drawn its armature.



   During the transmission of the selector code, the OR relay is disconnected from the RT transformer by opening the rest contact ± of the JBAP relay and it is kept inverted following the closing of the link going to terminal B on the working contact e of the JBAP relay so that the synchronization relays OLBP and LBP open, the relays OL2 and L2 remaining closed to prevent the formation of a code by the code system in time.



   The selector code sent over the line by the JP transformer comprises a series of short pulses of alternately opposite polarity with two spaced pauses. The station line R relays only work for alternate pulses of this kind i.e. only when the Y line is positive, but none of the selector codes contains the arrangement of long and short stages. characterizing the station code calls of the code system on time and none of the S relays are energized and none of the R relays remain; energized, long enough to open the L2 relays.



   At the end of the selector code, the JB and JBA relays open, the opening of the JBA relay causing the PC relay to attract A,

  <Desc / Clms Page number 69>

 its armature and the JBAP relay opens and the PCP relay then attracts its armature When the JBAP relay opens to disconnect the JT transformer and reconnect the battery 80 to the line circuit, the R relays remain open because line polarity inversion by the PC relay and the OR relay is kept inverted until the POP relay closes on the link with terminal B of the rest contact b of the PCT relay and the contact f- of the PC relay.

   Since all the synchronization relays, except the OL2 relay, remain open, the excitation of the PCP relay returns the OR relay to normal, via a circuit already indicated, comprising the work contact b of the PCP relay and the contact of relay OL2, thereby re-energizing the synchronization relays, but releasing the PC relay before the OLBP relay catches its arm and, then, the synchronization relays and the PCP relay open in the normal order with the OL1 relay which is the last to open while the PC relay, when open, restores the line polarity to normal to close the R line relays which re-energize their synchronization relays which then open in the normal order, the relay L1 being the last to open.



   When the office code unit of Figure 4 begins a command code, the MP relay closes its armature on the connection going to terminal B to wire 69 on the NO contact & of the OM relay and if a code wheel is released during transmission of the command code, the OM relay opens to stop a continuation of the transmission by opening the normally-closed contact a of the JBA relay but the MP relay remains closed until that the OLBP relay opens for a restraining circuit from its own make contact a and wire 82 to terminal B of contact e of the OLBP relay.

  <Desc / Clms Page number 70>

 



   It may happen that a selector code begins to close the JBA relay, during a long stage of opening a command code line. In this case, the OR relay is in its inverted position and the JBAP relay immediately draws its armature on the circuit going from the right contact a of the OR relay to the make contacts c of the MP and JBA relays. The JBAP relay keeps the OR relay inverted and releases the R line relays, thus releasing all the synchronization relays except the OL2 and L2 relays as described above and the system then automatically returns to normal due to of the excitation of the PC and PCB relays according to the coverage of the OLBP relay as described above.



   If the JBA relay attracts its armature during a closed line stadium of a command code, when the OR relay is normal, opening the OM relay by the JBA relay prevents the OT relay from attracting its armature to complete the stage line closed which is therefore extended until the OLBP and LBP relays open. When the OLBP relay opens, the M2 relay is de-energized and opens and, by closing its rest contact c, it closes the JBAP relay to open the line to end the stadium, opening the relays. line R and the changeover relay OR and placing the line under the control of the selector system. The time code system then assumes the same state as in the first case and is brought back to normal at the end of the selector code in the same way.



     It can be seen that, in each case, the stage during which the JBA relay attracts its armature is sufficiently prolonged so that each station LBP relay and the relays it controls open to stop any progress, without actuating any of the control relays. polar retainers such as WS.



   It may happen that the interrupt of the control code occurs after the start-up relay of the office, which

  <Desc / Clms Page number 71>

 booted the code, be opened. If the start relay is the 234ST relay, for example, it is kept energized on the rest contact i of the 234S relay until the relay closes on the fourth stage and then on the wire. 46 and the NO contact i of relay 234S and relay 234ST opens by opening of the NC contact ± of relay 8 during the eighth stage, If the JBA relay then attracts its armature, the 234ST relay is re-energized on the circuit going from terminal B, through the open contacts b of the MP and JBA relays, wire 67, the open contact k of the 234S relay, the 234ST relay, to terminal C of the closed contact of the button CB.

   As a result, as a result, an interrupted control code is transmitted in full after the selector code is terminated and the timing code system takes over control of the line.



   It may also happen that a selector code starts to close the JBA relay when an indication code is transmitted. In this case, the JBAP relay attracts its armature immediately by opening the line circuit to open the relays R, Ll, LP, LB, M and LBP and the meter and selection relays of the transmitting station and the relay of. OR excitation in the opposite direction to open the PC, OL1, OLP, PCP, OLB and OLBP relays and the counter and selection relays of the office. When the JBA relay opens at the end of the selector code, the JBAP relay opens and the PC and PCP relays are re-energized and the system is brought back to normal due to the energization of the PCP relay, as in the others case.



   It has already been said that the start relay of the station ST occupies its open position at the end of an indication code interrupted due to the opening of the relay LB before the opening of the relay M. as a result, an interrupted code indication is transmitted in full after the selector code is terminated and the code system in time resumes control of the line.

  <Desc / Clms Page number 72>

 



   Although one embodiment of the invention and several variants have been described, it is understood that various changes can be made to it without thereby departing from the scope of the invention.


    

Claims (1)

ABSTRACT Remote control system, in particular for rail traffic, characterized by the following points, together or separately: 1) It comprises a line relay which can alternately occupy a normal position and an inverse position for selected time intervals, two record relays, two synchronization relays controlled by the line relay and opening if the line relay remains in the normal or reverse position respectively for more than a determined time interval, closing and holding circuits for a recording relay, comprising normal and reverse contacts respectively of the line relay, the closing circuit also comprising a NC contact of one of the synchronization relays, the closing and retaining circuits of the other recording relay comprising reverse and normal contacts respectively of the line relay, this closing circuit also comprising a rest contact of the other synchronization relay, a series of relays of the polar restraint type and circuits for energizing these polar relays, one at a time, under the action of successive operations of the line relay, the circuits for alternating relays of this series comprising pole change contacts of the 'one of the recording relays and an inverted contact of the relay. line, those of the intermediate relays of the series comprising pole change contacts of the other recording relay and a normal contact of the line relay. <Desc / Clms Page number 73> 2) The line relay occupies its two positions under the action of the successive stages of a code with relatively short and long code elements, the closing circuits of the recording relays only closing when the line relay receives a long code element. 3) There is a chain of counter relays which are successively energized by operation of the line relay and a series of polar latch type relays, one for each of several of the counter relays, one circuit for energizing each pole relay. in normal or reverse direction, each of these circuits comprising a make or break contact of that of the two recording relays, the position of which indicates the nature of the immediately preceding code element. 4) A storage relay is controlled by each recording relay and a retention circuit, for each of these, has its own work contact, a circuit actuating each storage relay according to the position of the corresponding recording relay, each circuit comprising a contact closed by the line relay when the latter is actuated to control the other recording relay. 5) Two slow-opening relays are controlled, one by a make contact, the other by a line relay NC contact and two holding relays, one of which has a closing circuit comprising NC contacts. line relay and one of the slow-opening relays and a restraining circuit comprising a working contact of the line relay, the other restraining relay having a wedge-closing circuit carrying a working contact of the line relay and a rest contact of the other slow opening relay and a restraining circuit including a rest contact of the line relay. 6) A code receiver is made up of the series of counter relays whose contacts close, one at a time, for <Desc / Clms Page number 74> count the successive stages of a code and there are several sets of selector relays each of which has a different final selector relay, an input relay, a hold circuit for the input relay, controlled by a work contact of the first counter relay in the series, closing circuits for the first selector relay of each series, each comprising a work contact of the input relay and a work contact of another counter relay, a retained for the input relay comprising normally-closed contacts of all the first selector relays, a closing circuit for each of the remaining selector relays, this circuit comprising a work contact of the immediately preceding selector relay of the same series and a work contact of one of the counter relays, and a retention circuit for each of these relays except the last of each series comprising a normally closed contact of the neighboring selector relay of the same series. 7) The system comprises a code formation unit and several groups of storage units, a final selector relay in each storage unit, to control its operation, a first selector relay and a group of selector relays for each group of storage units, a series of contacts in this code forming unit, closing one at a time under the control of successive elements of a code, circuits opening all these first selector relays when one closes one of the contacts, a circuit prepared by each first selector relay to condition the associated group selector relay to activate any of these relays which can be activated when one of these different contacts is closed, a device actuated by the operation of one of these group selector relays to open all the first selector relays and to condition the final selector relays of the corresponding group to each operate under the action of closing <Desc / Clms Page number 75> a contact different from the successive contacts in the series. 8) A code receiving apparatus comprises a code forming unit, comprising a series of contacts, one for each code element, with, device closing these contacts, one at a time, so that the code elements are received successfully. - possibly, with several series of selector relays controlled by this code unit. 9) The code forming unit sends over the line circuit two groups of code elements, the first constituting a station code call and the second identifying the position of different mobile devices at that station, this unit. comprising a normally energized start-up relay, a normal holding circuit for these relays, comprising contacts of the mobile devices, momentarily opening to open the relay due to a change in position of one of these mobile devices , a device coming into action, when the start relay opens, to start sending a code to the code forming unit, a device re-energizing this start relay after the transmission of the first group of code elements, a temporary hold circuit closing when the start relay closes, comprising the contacts of the mobile devices as well as a contact which opens if the emission of the second group of code elements is interrupted and a device transferring the excitation of these relays from its temporary hold circuit to its circuit normal carry when the transmission of the second group of code elements is completed. 10) The code training unit comprises; a transmitter, a normally energized start-up relay, a normal hold circuit for this relay comprising a series of contacts each of which opens momentarily at times to open the relay, a device starting the transmission of a code when <Desc / Clms Page number 76> of this opening, a closing circuit for this relay, closed momentarily during the emission of an intermediate stage of the code, a. temporary holding circuit to keep this relay closed, comprising this series of contacts and an additional one which remains closed only when a code is sent. II) The start relay is of the polarized polar type and an inductance coil is in parallel with the coil of this relay, giving current to open this relay. when opening its retention circuit. 12) The code forming unit is controlled by several storage units each comprising a selector relay and a start relay with a normal restoring circuit for the latter relay. 13) A device located at the office, controlled by hand, allows the transmission of a code to be interrupted at an intermediate stage following those constituting the code apparatus. 14) The device comprises an emitting relay, a pulsating circuit energizing this relay intermittently, this circuit containing the relay winding and two resistors in series with it serving to adjust the relay closing time, one of these resistors being short-circuited after closing to adjust the opening time.